Comment 11 for bug 572162

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Kevin Mauser (kmauser) wrote : Re: Sudden reboot happens randomly

As Moraus said, after disabling KMS the problem goes away. You can disable KMS by adding "nomodest" in your grub (/etc/default/grub) file like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

It'll make the boot splash screen not look at nice, but at least your computer won't randomly crash. From my understanding, it seems that the reason this doesn't happen with Karmic is because KMS (Kernel Mode Setting) was added into Lucid and wasn't in Karmic. You might want to check out this link for more information: https://wiki.ubuntu.com/X/KernelModeSetting

This isn't really a solution - it's a temporary workaround. It'd be nice if someone would like into this. I haven't been able to find anything useful in the log files though.